有很多事情要做，时间飞逝。

There was plenty to do, and the time ___flew.

但你必须享受它，因为时光飞逝，你会在不知不觉中变老！

But you have to enjoy it because time ___flies, and you will be old before you know it!

当你沉浸在一本好书中时，时间飞逝。

When you're engrossed in a good book, time ___flies.